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2021 Trek

Rail 5

A 29″ aluminum frame full suspension enduro e-bike with high-end components.
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Manufacturer Price

$5,499
Weight51.9 lbs  
FrameAluminum
SuspensionFull, 150 / 160mm
ForkRockShox 35 Gold RL
ShockRockShox Deluxe Select+
Wheels29″ Aluminum
Drivetrain1 × 12
GroupsetX1, SX Eagle
MotorBosch 250W 85Nm mid-drive
BatteryBosch 500Wh
BrakesTektro Hydraulic Disc
SeatpostDropper
Where to Buy
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Rail 5
Other Enduro bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

27 mph

Rail 5

26 mph

Similar Bikes

Highest gear

(descending)

Reviews

Summary

The Trek Rail is a highly capable enduro e-MTB, praised for its powerful Bosch motor, excellent suspension performance, and versatile geometry. It excels in both climbing and descending, offering a balanced ride that encourages riders to push their limits. While it comes with a premium price tag, its technology and performance justify the cost for many.

Pros
  • Powerful Bosch motor with efficient power delivery

  • Excellent suspension performance for both climbing and descending

  • Versatile geometry adaptable to various terrains

  • High-quality carbon frame with sleek integration

  • Large battery capacity for extended rides

Cons
  • Premium price point may be prohibitive for some

  • Some electronic accessories and controls can be finicky

  • Limited size availability in certain models

  • Battery and motor can produce noise during operation

Key Quotes
The Rail is a wildly capable e-MTB that rips just as hard as its non-electric brethren, then powers you back up the mountain, no lift ticket necessary.
MTBR logoMTBR
Despite the extra reach and full-day ride battery capacity, the handling still feels lively and responsive on top of a rock-solid, surefooted baseline.
Bike Perfect logoBike Perfect
The Trek Rail is comfortable, confident and a blast to ride.
Vital MTB logoVital MTB

Feedback?

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Vital MTB
2022 Trek Rail 9.9 XX1 AXS E-Bike

Apr 2022 · BHowell

An excellent e-bike with a lot of electronics.

Highs
  • Well rounded ride

  • Suspension quality

  • Powerful Bosch motor

Lows
  • Seat angle could be steeper

  • Vulnerable Bosch controller and Kiox

Read Review

Bike Perfect
Trek Rail 9.9 first ride review: fully tech-loaded flagship, long travel, e-MTB

Mar 2022 · Guy Kesteven

Trek’s Rail 9.9 eMTB is loaded with carbon fiber and wireless tech. Guy Kesteven explores what the pricey Bosch powered flagship is like to ride on a wet and rocky Lake District demo loop

Highs
  • Lightweight yet super precise full carbon frame

  • Extended enduro geometry

  • Superbly controlled suspension performance

  • Latest big battery Bosch Smart System

  • Full SRAM AXS and Wiz comms componentry

Lows
  • Mega money

  • AirWiz feels gimmicky

Read Review

Electric Bike Review
Trek Rail 9.9 XX1 AXS Review

Jan 2022

Price: $13549.99.00 | Model Year: 2021, 2022 | Trek's best long-travel electric mountain bike, designed for All Mountain and Enduro Riding. Light weight optimum compaction low void (OCLV) carbon fiber and magnesium frame comes in three sizes. Flip chip spacer in the rear swing arm further refines geometry for low and high settings.

Observations
  • Trek's best long-travel electric mountain bike, designed for All Mountain and Enduro Riding. Light weight optimum compaction low void (OCLV) carbon fiber and magnesium frame comes in three sizes. Flip chip spacer in the rear swing arm further refines geometry for low and high settings.

  • Available in three premium color schemes, the bike is setup with 29" wheels but can accommodate 27.5" or a mixed mullet setup (smaller rear wheel, larger front). Sturdy 12mm and 15mm thru-axles with Boost hub spacing offer stronger spoke bracing angle. Magnetic 6mm hex wrench quick release lever makes trail-maintenance convenient.

  • SRAM AXS wireless electronic shifting, dropper post, and air pressure settings and alerts for the tires and suspension. Bosch Smart System LED Remote, Kiox 300 display, PowerTube 750 battery, and CX motor with eBike Flow app. Premium quad-piston hydraulic disc brakes with extra-large 220mm front extra thick front rotor. Bottle cage bosses and ABUS keyed-alike code keyset.

  • Excellent weight positioning with the motor and battery low and center, but the PowerTube 750 goes from 9.7lbs to 10.8lbs with the color-matched Trek RIB cover and handle. Longer wheelbase due to longer battery design. Two smartphone apps required to configure all of the electronics (SRAM AXS and Bosch eBike Flow). No USB charging with the Bosch LED Remote despite having a USB-C port built in.

Read Review

Bicycling
The Trek Rail 9.9 AXS eMTB Encompasses Greatness That Is Bedeviled by Gremlins

Oct 2021

Great performance e-bike, killer motor tune, but so many glitchy electronic accessories.

Read Review

Beta
Trek Introduces the 2022 Rail 9.9 and 9.8 E-Bikes

Oct 2021 · Beta

Longer, lower, smarter

Read Review

Pinkbike
First Ride: 2022 Trek Rail 9.9 - More Battery Power & Updated Geometry

Oct 2021 · Matt Beer

The Rail 9.9 now has a 750Wh battery and geometry numbers that are similar to the Slash's.

Read Review

NSMB
Trek Rail 9.8 XT Review

Jun 2021

Trek's Rail e-bike platform is smooth, powerful, and successfully walks the line between trail bike and something bigger.

Read Review

Loam Wolf
The Introduction – Trek Rail 7 vs. Trek Rail 9.9 Head to Head

May 2021

In the market for an eMTB like the Trek Rail 7 but curious if the price jump for a higher end spec is worth it? Check out this battle?

Read Review

Geometry
Specs
Build
Frame

Alpha Platinum Aluminium, Removable Integrated Battery (RIB), tapered head tube, Control Freak internal routing, magnesium rocker link, Motor Armour, Mino Link, ABP, Boost148, 12 mm thru axle, 150 mm travel

Tire Clearance2.6"

ColorsPurple Flip / Trek Black; Matte Olive Grey / Trek Black

Fork

RockShox 35 Gold RL, DebonAir spring, Motion Control damper, e-MTB optimised, tapered steerer, 44 mm offset, Boost110, 15 mm Maxle Stealth, 160mm travel

Travel160mm

Spring TypeAir

Shock

RockShox Deluxe Select+, 230 mm x 57.5 mm

Travel150mm

Stem

Bontrager Rhythm Comp, 31.8 mm, Knock Block, 0-degree, 50 mm length

Handlebar

Bontrager alloy, 31.8 mm, 15 mm rise, 750 mm width

Saddle

Bontrager Arvada, steel rails, 138 mm width

Seatpost

Size: S, TranzX JD-YSP18, 100 mm travel, internal routing, 31.6 mm, 361 mm length; Size: M, L, XL, TranzX JD-YSP18, 130mm travel, internal routing, 31.6 mm, 425 mm length

TypeDropper

Pedals

VP-536 nylon platform

Grips

Bontrager XR Trail Comp, nylon lock-on

Groupset
Rear Derailleur

SRAM SX Eagle

Crank

SRAM X1 1000, 34T, 165 mm length

Shifters

SRAM SX Eagle single-click, 12-speed

Cassette

SRAM PG-1210 Eagle, 11-50, 12-speed

Chain

SRAM SX Eagle, 12-speed

Brakes

Tektro HD-M745 4-piston hydraulic disc

TypeTektro Hydraulic Disc

Wheels
Rims

Alex MD35, tubeless compatible, 32-hole, 35 mm width, Presta valve

Front Hub

Bontrager sealed bearing, alloy axle, 6-bolt, Boost110, 15 mm thru axle

Rear Hub

Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Shimano 8/9/10 freehub, Boost148, 12 mm thru axle

Tires

Bontrager XR4 Comp, wire bead, 30 tpi, 29x2.60"

Disc Rotors

Tektro, 203 mm, 6-bolt

Electric Components
Motor

Bosch Performance CX, magnesium motor body, 250 watt, 85 Nm, 25 km/h (15.5 mph) max assist, 32 km/h for New Zealand

Battery

Bosch PowerTube, vertical, 500 wh

Remote

Bosch Purion

Charger

Bosch compact 2A, 100–240V, smart system

Rider Notes
Riders Also Viewed

First added July 31

Last updated October 1

Not listed for 1,336 days